Shaker-screen



E. E. BERRY.

-SHAKER SCREEN.

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E. L BERRY.'I SHAKER SCREEN.

APPLICATION FILED FEB. 2l, 1919- Patented Nov. 2, 1920.v

2 SHEETS*SHEET 2.

E w W `lJ NIT ED `Sillzli'l'l S PATENTY OFFICE.u

EARL E. BERRY, OF KENNETT'SQUARE, PENNSYLVANIA, ASSIGNOR TO AMERICAN ROAD MACHINERY COMPANY, INC., OF KENNETH) SGU-ARE, PENNSYLVANIA, A

CORPORATION 0F DELAWARE.

SHAKER-SCREEN.

Leanser.

Specification of Letters Patent.

Patented N v. 2, 1920.

To all whom t may concern.'

Be it known that l, EARL E. BERRY, a citizen of the United States, residing at Kennett Square, county of Chester, and State of Pennsylvania, have invented a new and usel'ul Improvement in ShakenScreens, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification..

My invention relates to shaker screens and has for its object to improve the general construction of the screen and improved means tor imparting such vibrating movements to the screen as will elfl'ectV the continuous agitation of the material and prevent material, such as wedge-shaped stones, clinging to the screen sections.

It is known, in shaker screens, to actuate them from connecting rods operated from eccentrics or cranks on a common shaft, and also to secure such rods rigidly to the screen and to provide the rods with reduced sections or otherwise provide for allowing them to flex to allow for the constant change in the angular direction of extension of the rods from the screen. @ne of the specific objects of my invention is to provide improved means for securing the rods to the screens. The invention also comprises an oscillating knocker to prevent any material clinging to the screen sections and improvements in the general construction.

A preferred embodiment ot my invention is shown in the accompanying drawings, in which- Figurel is a general plan view of the screen structure.

Fig. 2 is a general side elevation ot the same.

Fig. 3 is an enlarged detail side view of the connecting rod and its connections.

Fig. l is an enlarged cross-section on the line 4-4 of Fig. l.

Fig. 5 is an enlarged detail sectional view on line 5 5 of Fig. 3.

From the transverse wooden cross-beams a depend flexible hangers to which are bolted opposite ends of transverse angle bars c. Near opposite ends of angle bars 0 longitudinally extending channel bars Z are secured. These channels form the sides of the screen proper.

The screen sections e are bolted to these channels. There are two sets of screens at dillerent levels.

The connecting rods are secured to the screens in the following manner. To each of the channels Z are bolted an upright gusset plate y and an angle 7L, another angle it being bolted to the top of the gusset plate. lhe plate g and angles it, it', form a channel in which neatly fits the end of a connecting rod 7a. To the gusset plate is attached a circular steel disk t' closely fitting a recess in the connecting rod. Bolts j draw the rod k to the plate g, one of the bolts extending through the disk i. The disk 1'. acts as a thrust bearing. lVhen the bolts are drawn up for attaching the gusset plate to the connecting rod, the described construction gives a tight fit, eliminatingthe load from the bolts and avoiding the possibility ol' the parts coming loose.

Each connecting rod lo is of wood and is tapered down to a small section in the middle; so as to give the 'necessary flexibility. The end ot the rod adjacent the crank shaft is reinforced by top and bottom metal strips m and a metal end head n bolted to end flanges on the strips m. The rod is oriiced to receive its corresponding crank on the shaft 0.

There are :tour cranks and four correspending connecting rods. Two of these rods are secured to opposite sides ot the lower screen structure. rlhe other two rods actuate the upper screen structure.

Knocker rods r extend across beneath each screen adjacent its bottom. Each rod at each end is bent upward and inward and turns in a bearing S secured to a channel d. The bearing has a removable bushing and is protected trom sand and water by being covered with a cap t, which in turn carries a grease cup u for lubrication. The knocker rod r is caused to oscillate back and forth by the reciprocatory motion of the screen itself. The rod, in its swinging movement, hits the bottoni ol the corresponding screen section, causing a rapid vibration thereof,

`thereby dislodging from the screen section any wedge-shaped stones or other material which `otherwise would cling tightly thereto. Having noW fully described my invention,

what claim and desire to protect byvLetters Patent is:

l.' A shaker screen, having a channel structure, a connecting rod extending into said channel structure, the inner side of the connecting rod being recessed, a disk Within said recess, and means for clamping the faces of the disk between the channel structure and the bottom of the recess in the connecting rod.

2. A shaker screen', having a channel structure secured thereto, a connecting rod, one of the ends of the connecting rod being bolted between the iianges of the channel structure, the bolt passing through the side of the channel structure and the connecting rod, there being a recess formed in the connecting rod, athrust plate for the connecting rod Within said recess and engaging the side of the channel structure, and a bolt passing through the connectingrod, thrust plate and the side o the channel structure for securing the parts in position with relation to each other.

`In testimony of which invention, l have hereunto set my hand, at Kennett Square,

' Pa., on this 18 day of February, 1919.

EARL E. BERRY.

Vitnesses Gmo. CALVEBT, M. RosnNDAHL. 

